OBD-II · CODE FAMILY
Codes U35xx — what they mean
U35xx is a family of 119 manufacturer-specific OBD2 codes covering network and electrical faults. Each U35xx code below links to its own page with causes, diagnosis and the parts to fix it.
119 codesNetwork systems
FAMILY
RangeU3500–U3576
Codes119
TROUBLEATLAS APP
01All codes in this family
One rich, indexed page — not thousands of empty ones. Each code links to its own page.
| Code | Meaning — click to open the code page | System | Severity |
|---|---|---|---|
| U3500 | Control Module Input Power A Circuit Range/Performance → /auto/codes/u3500/ Control Module Input Power A Circuit Range/Performance | Network | Medium |
| U3501 | Control Module Input Power A Circuit Low → /auto/codes/u3501/ Control Module Input Power A Circuit Low | Network | Medium |
| U3502 | Control Module Input Power A Circuit High → /auto/codes/u3502/ Control Module Input Power A Circuit High | Network | Medium |
| U3503 | Control Module Input Power A Circuit Intermittent/Erratic → /auto/codes/u3503/ Control Module Input Power A Circuit Intermittent/Erratic | Network | Medium |
| U3504 | Control Module Input Power B Circuit Range/Performance → /auto/codes/u3504/ Control Module Input Power B Circuit Range/Performance | Network | Medium |
| U3505 | Control Module Input Power B Circuit Low → /auto/codes/u3505/ Control Module Input Power B Circuit Low | Network | Medium |
| U3506 | Control Module Input Power B Circuit High → /auto/codes/u3506/ Control Module Input Power B Circuit High | Network | Medium |
| U3507 | Control Module Input Power B Circuit Intermittent/Erratic → /auto/codes/u3507/ Control Module Input Power B Circuit Intermittent/Erratic | Network | Medium |
| U3508 | Control Module Input Power C Circuit Range/Performance → /auto/codes/u3508/ Control Module Input Power C Circuit Range/Performance | Network | Medium |
| U3509 | Control Module Input Power C Circuit Low → /auto/codes/u3509/ Control Module Input Power C Circuit Low | Network | Medium |
| U350A | Control Module Input Power C Circuit High → /auto/codes/u350a/ Control Module Input Power C Circuit High | Network | Medium |
| U350B | Control Module Input Power C Circuit Intermittent/Erratic → /auto/codes/u350b/ Control Module Input Power C Circuit Intermittent/Erratic | Network | Medium |
| U350C | Control Module Cooling Fan Circuit/Open → /auto/codes/u350c/ Control Module Cooling Fan Circuit/Open | Network | Medium |
| U350D | Control Module Cooling Fan Circuit Low → /auto/codes/u350d/ Control Module Cooling Fan Circuit Low | Network | Medium |
| U350E | Control Module Cooling Fan Circuit High → /auto/codes/u350e/ Control Module Cooling Fan Circuit High | Network | Medium |
| U350F | Control Module Cooling Fan Circuit Range/Performance → /auto/codes/u350f/ Control Module Cooling Fan Circuit Range/Performance | Network | Medium |
| U3510 | Control Module Missing Calibration → /auto/codes/u3510/ Control Module Missing Calibration | Network | Medium |
| U3511 | High Voltage System Interlock Circuit B → /auto/codes/u3511/ High Voltage System Interlock Circuit B | Network | Medium |
| U3512 | High Voltage System Interlock Circuit B Performance → /auto/codes/u3512/ High Voltage System Interlock Circuit B Performance | Network | Medium |
| U3513 | High Voltage System Interlock Circuit B Low → /auto/codes/u3513/ High Voltage System Interlock Circuit B Low | Network | Medium |
| U3514 | High Voltage System Interlock Circuit B High → /auto/codes/u3514/ High Voltage System Interlock Circuit B High | Network | Medium |
| U3515 | High Voltage System Interlock Circuit C → /auto/codes/u3515/ High Voltage System Interlock Circuit C | Network | Medium |
| U3516 | High Voltage System Interlock Circuit C Performance → /auto/codes/u3516/ High Voltage System Interlock Circuit C Performance | Network | Medium |
| U3517 | High Voltage System Interlock Circuit C Low → /auto/codes/u3517/ High Voltage System Interlock Circuit C Low | Network | Medium |
| U3518 | High Voltage System Interlock Circuit C High → /auto/codes/u3518/ High Voltage System Interlock Circuit C High | Network | Medium |
| U3519 | High Voltage System Interlock Circuit D → /auto/codes/u3519/ High Voltage System Interlock Circuit D | Network | Medium |
| U351A | High Voltage System Interlock Circuit D Performance → /auto/codes/u351a/ High Voltage System Interlock Circuit D Performance | Network | Medium |
| U351B | High Voltage System Interlock Circuit D Low → /auto/codes/u351b/ High Voltage System Interlock Circuit D Low | Network | Medium |
| U351C | High Voltage System Interlock Circuit D High → /auto/codes/u351c/ High Voltage System Interlock Circuit D High | Network | Medium |
| U351D | High Voltage System Interlock Circuit E → /auto/codes/u351d/ High Voltage System Interlock Circuit E | Network | Medium |
| U351E | High Voltage System Interlock Circuit E Performance → /auto/codes/u351e/ High Voltage System Interlock Circuit E Performance | Network | Medium |
| U351F | High Voltage System Interlock Circuit E Low → /auto/codes/u351f/ High Voltage System Interlock Circuit E Low | Network | Medium |
| U3520 | High Voltage System Interlock Circuit E High → /auto/codes/u3520/ High Voltage System Interlock Circuit E High | Network | Medium |
| U3521 | High Voltage System Interlock Circuit F → /auto/codes/u3521/ High Voltage System Interlock Circuit F | Network | Medium |
| U3522 | High Voltage System Interlock Circuit F Performance → /auto/codes/u3522/ High Voltage System Interlock Circuit F Performance | Network | Medium |
| U3523 | High Voltage System Interlock Circuit F Low → /auto/codes/u3523/ High Voltage System Interlock Circuit F Low | Network | Medium |
| U3524 | High Voltage System Interlock Circuit F High → /auto/codes/u3524/ High Voltage System Interlock Circuit F High | Network | Medium |
| U3525 | High Voltage System Interlock Circuit G → /auto/codes/u3525/ High Voltage System Interlock Circuit G | Network | Medium |
| U3526 | High Voltage System Interlock Circuit G Performance → /auto/codes/u3526/ High Voltage System Interlock Circuit G Performance | Network | Medium |
| U3527 | High Voltage System Interlock Circuit G Low → /auto/codes/u3527/ High Voltage System Interlock Circuit G Low | Network | Medium |
| U3528 | High Voltage System Interlock Circuit G High → /auto/codes/u3528/ High Voltage System Interlock Circuit G High | Network | Medium |
| U3529 | High Voltage System Interlock Circuit H → /auto/codes/u3529/ High Voltage System Interlock Circuit H | Network | Medium |
| U352A | High Voltage System Interlock Circuit H Performance → /auto/codes/u352a/ High Voltage System Interlock Circuit H Performance | Network | Medium |
| U352B | High Voltage System Interlock Circuit H Low → /auto/codes/u352b/ High Voltage System Interlock Circuit H Low | Network | Medium |
| U352C | High Voltage System Interlock Circuit H High → /auto/codes/u352c/ High Voltage System Interlock Circuit H High | Network | Medium |
| U352D | High Voltage System Interlock Circuit J → /auto/codes/u352d/ High Voltage System Interlock Circuit J | Network | Medium |
| U352E | High Voltage System Interlock Circuit J Performance → /auto/codes/u352e/ High Voltage System Interlock Circuit J Performance | Network | Medium |
| U352F | High Voltage System Interlock Circuit J Low → /auto/codes/u352f/ High Voltage System Interlock Circuit J Low | Network | Medium |
| U3530 | High Voltage System Interlock Circuit J High → /auto/codes/u3530/ High Voltage System Interlock Circuit J High | Network | Medium |
| U3531 | High Voltage System Interlock Circuit K → /auto/codes/u3531/ High Voltage System Interlock Circuit K | Network | Medium |
| U3532 | High Voltage System Interlock Circuit K Performance → /auto/codes/u3532/ High Voltage System Interlock Circuit K Performance | Network | Medium |
| U3533 | High Voltage System Interlock Circuit K Low → /auto/codes/u3533/ High Voltage System Interlock Circuit K Low | Network | Medium |
| U3534 | High Voltage System Interlock Circuit K High → /auto/codes/u3534/ High Voltage System Interlock Circuit K High | Network | Medium |
| U3535 | High Voltage System Interlock Circuit L → /auto/codes/u3535/ High Voltage System Interlock Circuit L | Network | Medium |
| U3536 | High Voltage System Interlock Circuit L Performance → /auto/codes/u3536/ High Voltage System Interlock Circuit L Performance | Network | Medium |
| U3537 | High Voltage System Interlock Circuit L Low → /auto/codes/u3537/ High Voltage System Interlock Circuit L Low | Network | Medium |
| U3538 | High Voltage System Interlock Circuit L High → /auto/codes/u3538/ High Voltage System Interlock Circuit L High | Network | Medium |
| U3539 | High Voltage System Interlock Circuit M → /auto/codes/u3539/ High Voltage System Interlock Circuit M | Network | Medium |
| U353A | High Voltage System Interlock Circuit M Performance → /auto/codes/u353a/ High Voltage System Interlock Circuit M Performance | Network | Medium |
| U353B | High Voltage System Interlock Circuit M Low → /auto/codes/u353b/ High Voltage System Interlock Circuit M Low | Network | Medium |
| U353C | High Voltage System Interlock Circuit M High → /auto/codes/u353c/ High Voltage System Interlock Circuit M High | Network | Medium |
| U353D | High Voltage System Interlock Circuit N → /auto/codes/u353d/ High Voltage System Interlock Circuit N | Network | Medium |
| U353E | High Voltage System Interlock Circuit N Performance → /auto/codes/u353e/ High Voltage System Interlock Circuit N Performance | Network | Medium |
| U353F | High Voltage System Interlock Circuit N Low → /auto/codes/u353f/ High Voltage System Interlock Circuit N Low | Network | Medium |
| U3540 | High Voltage System Interlock Circuit N High → /auto/codes/u3540/ High Voltage System Interlock Circuit N High | Network | Medium |
| U3541 | High Voltage System Interlock Circuit O → /auto/codes/u3541/ High Voltage System Interlock Circuit O | Network | Medium |
| U3542 | High Voltage System Interlock Circuit O Performance → /auto/codes/u3542/ High Voltage System Interlock Circuit O Performance | Network | Medium |
| U3543 | High Voltage System Interlock Circuit O Low → /auto/codes/u3543/ High Voltage System Interlock Circuit O Low | Network | Medium |
| U3544 | High Voltage System Interlock Circuit O High → /auto/codes/u3544/ High Voltage System Interlock Circuit O High | Network | Medium |
| U3545 | High Voltage System Interlock Circuit P → /auto/codes/u3545/ High Voltage System Interlock Circuit P | Network | Medium |
| U3546 | High Voltage System Interlock Circuit P Performance → /auto/codes/u3546/ High Voltage System Interlock Circuit P Performance | Network | Medium |
| U3547 | High Voltage System Interlock Circuit P Low → /auto/codes/u3547/ High Voltage System Interlock Circuit P Low | Network | Medium |
| U3548 | High Voltage System Interlock Circuit P High → /auto/codes/u3548/ High Voltage System Interlock Circuit P High | Network | Medium |
| U3549 | Hydrogen Tank High Pressure Sensor 1 Circuit → /auto/codes/u3549/ Hydrogen Tank High Pressure Sensor 1 Circuit | Network | Medium |
| U354A | Hydrogen Tank A Temperature Sensor 1 Circuit → /auto/codes/u354a/ Hydrogen Tank A Temperature Sensor 1 Circuit | Network | Medium |
| U354B | Hydrogen Tank A Temperature Sensor 2 Circuit → /auto/codes/u354b/ Hydrogen Tank A Temperature Sensor 2 Circuit | Network | Medium |
| U354C | Hydrogen Tank B Temperature Sensor 1 Circuit → /auto/codes/u354c/ Hydrogen Tank B Temperature Sensor 1 Circuit | Network | Medium |
| U354D | Hydrogen Tank B Temperature Sensor 2 Circuit → /auto/codes/u354d/ Hydrogen Tank B Temperature Sensor 2 Circuit | Network | Medium |
| U354E | Hydrogen Tank C Temperature Sensor 1 Circuit → /auto/codes/u354e/ Hydrogen Tank C Temperature Sensor 1 Circuit | Network | Medium |
| U354F | Hydrogen Tank C Temperature Sensor 2 Circuit → /auto/codes/u354f/ Hydrogen Tank C Temperature Sensor 2 Circuit | Network | Medium |
| U3550 | Hydrogen Tank A Valve Control Circuit → /auto/codes/u3550/ Hydrogen Tank A Valve Control Circuit | Network | Medium |
| U3551 | Hydrogen Tank A Valve Enable Circuit → /auto/codes/u3551/ Hydrogen Tank A Valve Enable Circuit | Network | Medium |
| U3552 | Hydrogen Tank A Valve Performance → /auto/codes/u3552/ Hydrogen Tank A Valve Performance | Network | Medium |
| U3553 | Hydrogen Tank B Valve Control Circuit → /auto/codes/u3553/ Hydrogen Tank B Valve Control Circuit | Network | Medium |
| U3554 | Hydrogen Tank B Valve Enable Circuit → /auto/codes/u3554/ Hydrogen Tank B Valve Enable Circuit | Network | Medium |
| U3555 | Hydrogen Tank B Valve Performance → /auto/codes/u3555/ Hydrogen Tank B Valve Performance | Network | Medium |
| U3556 | Hydrogen Tank C Valve Control Circuit → /auto/codes/u3556/ Hydrogen Tank C Valve Control Circuit | Network | Medium |
| U3557 | Hydrogen Tank C Valve Enable Circuit → /auto/codes/u3557/ Hydrogen Tank C Valve Enable Circuit | Network | Medium |
| U3558 | Hydrogen Tank C Valve → /auto/codes/u3558/ Hydrogen Tank C Valve | Network | Medium |
| U3559 | Air Inlet Pressure Sensor Circuit → /auto/codes/u3559/ Air Inlet Pressure Sensor Circuit | Network | Medium |
| U355A | Charge Air Cooler Outlet Pressure Sensor 1 Circuit → /auto/codes/u355a/ Charge Air Cooler Outlet Pressure Sensor 1 Circuit | Network | Medium |
| U355B | Charge Air Cooler Outlet Pressure Sensor 2 Circuit → /auto/codes/u355b/ Charge Air Cooler Outlet Pressure Sensor 2 Circuit | Network | Medium |
| U355C | Charge Air Cooler Outlet Temperature Sensor Circuit → /auto/codes/u355c/ Charge Air Cooler Outlet Temperature Sensor Circuit | Network | Medium |
| U355D | Expander Inlet Pressure Sensor 1 Circuit → /auto/codes/u355d/ Expander Inlet Pressure Sensor 1 Circuit | Network | Medium |
| U355E | Expander Inlet Pressure Sensor 2 Circuit → /auto/codes/u355e/ Expander Inlet Pressure Sensor 2 Circuit | Network | Medium |
| U355F | Cathode Backpressure Valve Control Circuit → /auto/codes/u355f/ Cathode Backpressure Valve Control Circuit | Network | Medium |
| U3560 | Cathode Backpressure Valve Position Sensor Circuit → /auto/codes/u3560/ Cathode Backpressure Valve Position Sensor Circuit | Network | Medium |
| U3561 | Cathode Bypass Valve Control Circuit → /auto/codes/u3561/ Cathode Bypass Valve Control Circuit | Network | Medium |
| U3562 | Cathode Bypass Valve → /auto/codes/u3562/ Cathode Bypass Valve | Network | Medium |
| U3563 | Cathode Bypass Valve Position Sensor Circuit → /auto/codes/u3563/ Cathode Bypass Valve Position Sensor Circuit | Network | Medium |
| U3564 | Hydrogen Supply Line A Pressure Sensor 1 Circuit → /auto/codes/u3564/ Hydrogen Supply Line A Pressure Sensor 1 Circuit | Network | Medium |
| U3565 | Hydrogen Supply Line A Pressure Sensor 2 Circuit → /auto/codes/u3565/ Hydrogen Supply Line A Pressure Sensor 2 Circuit | Network | Medium |
| U3566 | Anode Inlet Pressure Sensor 1 Circuit → /auto/codes/u3566/ Anode Inlet Pressure Sensor 1 Circuit | Network | Medium |
| U3567 | Anode Inlet Pressure Sensor 2 Circuit → /auto/codes/u3567/ Anode Inlet Pressure Sensor 2 Circuit | Network | Medium |
| U3568 | Anode Multifunction Valve Control Circuit → /auto/codes/u3568/ Anode Multifunction Valve Control Circuit | Network | Medium |
| U3569 | Anode Multifunction Valve → /auto/codes/u3569/ Anode Multifunction Valve | Network | Medium |
| U356A | Anode Drain Valve Control Circuit → /auto/codes/u356a/ Anode Drain Valve Control Circuit | Network | Medium |
| U356B | Anode Drain Valve → /auto/codes/u356b/ Anode Drain Valve | Network | Medium |
| U356C | Anode Header Drain Valve Control Circuit → /auto/codes/u356c/ Anode Header Drain Valve Control Circuit | Network | Medium |
| U356D | Anode Header Drain Valve → /auto/codes/u356d/ Anode Header Drain Valve | Network | Medium |
| U356E | Anode Drain Valve Heater Relay Control Circuit → /auto/codes/u356e/ Anode Drain Valve Heater Relay Control Circuit | Network | Medium |
| U356F | Anode Header Drain Valve Heater Relay Control Circuit → /auto/codes/u356f/ Anode Header Drain Valve Heater Relay Control Circuit | Network | Medium |
| U3570 | Stack Inlet Coolant Temperature Sensor Circuit → /auto/codes/u3570/ Stack Inlet Coolant Temperature Sensor Circuit | Network | Medium |
| U3571 | Stack Outlet Coolant Temperature Sensor 1 Circuit → /auto/codes/u3571/ Stack Outlet Coolant Temperature Sensor 1 Circuit | Network | Medium |
| U3572 | Stack Outlet Coolant Temperature Sensor 2 Circuit → /auto/codes/u3572/ Stack Outlet Coolant Temperature Sensor 2 Circuit | Network | Medium |
| U3573 | Coolant Mixing Valve Control Circuit → /auto/codes/u3573/ Coolant Mixing Valve Control Circuit | Network | Medium |
| U3574 | Coolant Mixing Valve → /auto/codes/u3574/ Coolant Mixing Valve | Network | Medium |
| U3575 | Coolant Mixing Valve Position Sensor Circuit → /auto/codes/u3575/ Coolant Mixing Valve Position Sensor Circuit | Network | Medium |
| U3576 | Stack Differential Pressure Sensor Circuit → /auto/codes/u3576/ Stack Differential Pressure Sensor Circuit | Network | Medium |
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